mirror of
https://github.com/matrix-construct/construct
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376 lines
10 KiB
C
376 lines
10 KiB
C
/* authd/provider.c - authentication provider framework
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* Copyright (c) 2016 Elizabeth Myers <elizabeth@interlinked.me>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice is present in all copies.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/* The basic design here is to have "authentication providers" that do things
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* like query ident and blacklists and even open proxies.
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*
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* Providers are registered in the auth_providers linked list. It is planned to
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* use a bitmap to store provider ID's later.
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*
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* Providers can either return failure immediately, immediate acceptance, or do
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* work in the background (calling set_provider to signal this).
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*
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* Provider-specific data for each client can be kept in an index of the data
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* struct member (using the provider's ID).
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*
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* All providers must implement at a minimum a perform_provider function. You
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* don't have to implement the others if you don't need them.
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*
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* Providers may kick clients off by rejecting them. Upon rejection, all
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* providers are cancelled. They can also unconditionally accept them.
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*
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* When a provider is done and is neutral on accepting/rejecting a client, it
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* should call provider_done. Do NOT call this if you have accepted or rejected
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* the client.
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*
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* Eventually, stuff like *:line handling will be moved here, but that means we
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* have to talk to bandb directly first.
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*
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* --Elizafox, 9 March 2016
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*/
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#include "stdinc.h"
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#include "rb_dictionary.h"
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#include "authd.h"
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#include "provider.h"
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#include "notice.h"
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static EVH provider_timeout_event;
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rb_dlink_list auth_providers;
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/* Clients waiting */
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rb_dictionary *auth_clients;
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static struct ev_entry *timeout_ev;
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/* Load a provider */
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void
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load_provider(struct auth_provider *provider)
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{
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if(rb_dlink_list_length(&auth_providers) >= MAX_PROVIDERS)
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{
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warn_opers(L_WARN, "provider: cannot load provider with id %d: maximum reached (%d)",
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provider->id, MAX_PROVIDERS);
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return;
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}
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if(provider->opt_handlers != NULL)
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{
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struct auth_opts_handler *handler;
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for(handler = provider->opt_handlers; handler->option != NULL; handler++)
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rb_dictionary_add(authd_option_handlers, handler->option, handler);
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}
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if(provider->stats_handler.letter != '\0')
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authd_stat_handlers[provider->stats_handler.letter] = provider->stats_handler.handler;
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if(provider->init != NULL)
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provider->init();
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rb_dlinkAddTail(provider, &provider->node, &auth_providers);
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}
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void
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unload_provider(struct auth_provider *provider)
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{
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if(provider->opt_handlers != NULL)
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{
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struct auth_opts_handler *handler;
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for(handler = provider->opt_handlers; handler->option != NULL; handler++)
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rb_dictionary_delete(authd_option_handlers, handler->option);
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}
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if(provider->stats_handler.letter != '\0')
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authd_stat_handlers[provider->stats_handler.letter] = NULL;
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if(provider->destroy != NULL)
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provider->destroy();
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rb_dlinkDelete(&provider->node, &auth_providers);
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}
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/* Initalise all providers */
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void
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init_providers(void)
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{
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auth_clients = rb_dictionary_create("pending auth clients", rb_uint32cmp);
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timeout_ev = rb_event_addish("provider_timeout_event", provider_timeout_event, NULL, 1);
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load_provider(&rdns_provider);
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load_provider(&ident_provider);
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load_provider(&blacklist_provider);
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load_provider(&opm_provider);
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}
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/* Terminate all providers */
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void
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destroy_providers(void)
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{
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rb_dlink_node *ptr;
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rb_dictionary_iter iter;
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struct auth_client *auth;
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struct auth_provider *provider;
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/* Cancel outstanding connections */
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RB_DICTIONARY_FOREACH(auth, &iter, auth_clients)
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{
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/* TBD - is this the right thing? */
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reject_client(auth, -1, "destroy", "Authentication system is down... try reconnecting in a few seconds");
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}
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RB_DLINK_FOREACH(ptr, auth_providers.head)
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{
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provider = ptr->data;
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if(provider->destroy)
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provider->destroy();
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}
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rb_event_delete(timeout_ev);
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}
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/* Cancel outstanding providers for a client */
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void
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cancel_providers(struct auth_client *auth)
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{
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rb_dlink_node *ptr;
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struct auth_provider *provider;
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RB_DLINK_FOREACH(ptr, auth_providers.head)
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{
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provider = ptr->data;
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if(provider->cancel && is_provider_on(auth, provider->id))
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/* Cancel if required */
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provider->cancel(auth);
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}
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rb_dictionary_delete(auth_clients, RB_UINT_TO_POINTER(auth->cid));
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rb_free(auth);
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}
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/* Provider is done - WARNING: do not use auth instance after calling! */
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void
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provider_done(struct auth_client *auth, provider_t id)
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{
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rb_dlink_node *ptr;
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struct auth_provider *provider;
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set_provider_off(auth, id);
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set_provider_done(auth, id);
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if(!auth->providers)
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{
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if(!auth->providers_starting)
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/* Only do this when there are no providers left */
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accept_client(auth, -1);
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return;
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}
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RB_DLINK_FOREACH(ptr, auth_providers.head)
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{
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provider = ptr->data;
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if(provider->completed != NULL && is_provider_on(auth, provider->id))
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/* Notify pending clients who asked for it */
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provider->completed(auth, id);
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}
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}
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/* Reject a client - WARNING: do not use auth instance after calling! */
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void
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reject_client(struct auth_client *auth, provider_t id, const char *data, const char *fmt, ...)
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{
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char reject;
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char buf[BUFSIZE];
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va_list args;
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switch(id)
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{
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case PROVIDER_RDNS:
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reject = 'D';
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break;
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case PROVIDER_IDENT:
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reject = 'I';
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break;
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case PROVIDER_BLACKLIST:
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reject = 'B';
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break;
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case PROVIDER_OPM:
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reject = 'O';
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break;
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default:
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reject = 'N';
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break;
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}
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if(data == NULL)
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data = "*";
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va_start(args, fmt);
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vsnprintf(buf, sizeof(buf), fmt, args);
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va_end(args);
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/* We send back username and hostname in case ircd wants to overrule our decision.
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* In the future this may not be the case.
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* --Elizafox
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*/
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rb_helper_write(authd_helper, "R %x %c %s %s %s :%s", auth->cid, reject, auth->username, auth->hostname, data, buf);
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set_provider_off(auth, id);
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cancel_providers(auth);
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}
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/* Accept a client, cancel outstanding providers if any - WARNING: do nto use auth instance after calling! */
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void
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accept_client(struct auth_client *auth, provider_t id)
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{
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rb_helper_write(authd_helper, "A %x %s %s", auth->cid, auth->username, auth->hostname);
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set_provider_off(auth, id);
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cancel_providers(auth);
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}
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/* Begin authenticating user */
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static void
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start_auth(const char *cid, const char *l_ip, const char *l_port, const char *c_ip, const char *c_port)
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{
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struct auth_provider *provider;
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struct auth_client *auth = rb_malloc(sizeof(struct auth_client));
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long lcid = strtol(cid, NULL, 16);
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rb_dlink_node *ptr;
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if(lcid >= UINT32_MAX)
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return;
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auth->cid = (uint32_t)lcid;
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if(rb_dictionary_find(auth_clients, RB_UINT_TO_POINTER(auth->cid)) == NULL)
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rb_dictionary_add(auth_clients, RB_UINT_TO_POINTER(auth->cid), auth);
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else
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{
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warn_opers(L_CRIT, "provider: duplicate client added via start_auth: %x", auth->cid);
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exit(EX_PROVIDER_ERROR);
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}
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rb_strlcpy(auth->l_ip, l_ip, sizeof(auth->l_ip));
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auth->l_port = (uint16_t)atoi(l_port); /* should be safe */
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(void) rb_inet_pton_sock(l_ip, (struct sockaddr *)&auth->l_addr);
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SET_SS_PORT(&auth->l_addr, htons(auth->l_port));
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rb_strlcpy(auth->c_ip, c_ip, sizeof(auth->c_ip));
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auth->c_port = (uint16_t)atoi(c_port);
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(void) rb_inet_pton_sock(c_ip, (struct sockaddr *)&auth->c_addr);
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SET_SS_PORT(&auth->c_addr, htons(auth->c_port));
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rb_strlcpy(auth->hostname, "*", sizeof(auth->hostname));
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rb_strlcpy(auth->username, "*", sizeof(auth->username));
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memset(auth->data, 0, sizeof(auth->data));
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auth->providers_starting = true;
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RB_DLINK_FOREACH(ptr, auth_providers.head)
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{
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provider = ptr->data;
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lrb_assert(provider->start != NULL);
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/* Execute providers */
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if(!provider->start(auth))
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{
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/* Rejected immediately */
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cancel_providers(auth);
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return;
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}
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}
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auth->providers_starting = false;
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/* If no providers are running, accept the client */
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if(!auth->providers)
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accept_client(auth, -1);
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}
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/* Callback for the initiation */
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void
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handle_new_connection(int parc, char *parv[])
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{
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if(parc < 6)
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{
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warn_opers(L_CRIT, "provider: received too few params for new connection (6 expected, got %d)", parc);
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exit(EX_PROVIDER_ERROR);
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}
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start_auth(parv[1], parv[2], parv[3], parv[4], parv[5]);
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}
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void
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handle_cancel_connection(int parc, char *parv[])
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{
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struct auth_client *auth;
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long lcid;
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if(parc < 2)
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{
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warn_opers(L_CRIT, "provider: received too few params for new connection (2 expected, got %d)", parc);
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exit(EX_PROVIDER_ERROR);
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}
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if((lcid = strtol(parv[1], NULL, 16)) > UINT32_MAX)
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{
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warn_opers(L_CRIT, "provider: got a request to cancel a connection that can't exist: %lx", lcid);
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exit(EX_PROVIDER_ERROR);
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}
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if((auth = rb_dictionary_retrieve(auth_clients, RB_UINT_TO_POINTER((uint32_t)lcid))) == NULL)
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{
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/* This could happen as a race if we've accepted/rejected but they cancel, so don't die here.
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* --Elizafox */
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return;
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}
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cancel_providers(auth);
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}
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static void
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provider_timeout_event(void *notused __unused)
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{
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struct auth_client *auth;
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rb_dictionary_iter iter;
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const time_t curtime = rb_current_time();
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RB_DICTIONARY_FOREACH(auth, &iter, auth_clients)
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{
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rb_dlink_node *ptr;
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RB_DLINK_FOREACH(ptr, auth_providers.head)
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{
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struct auth_provider *provider = ptr->data;
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const time_t timeout = auth->timeout[provider->id];
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if(is_provider_on(auth, provider->id) && provider->timeout != NULL &&
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timeout > 0 && timeout < curtime)
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{
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provider->timeout(auth);
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}
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}
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}
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}
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